Mp4 90834723 39s39 Nippyfile Mp4 Portable ✦ | RECOMMENDED |

| | Description | Priority | |----------|----------------|--------------| | FR‑1 | Unique ID Header – prepend a 8‑byte (or 64‑bit) identifier ( 90834723 in decimal) to the MP4 file in a custom “NIP” atom that does not break standard MP4 parsers. | Must | | FR‑2 | Portable Flag – embed a proprietary npft atom that signals “portable mode”. Player components that understand the flag will enable fast‑track initialization (skip optional tracks, use bundled codec hints). | Must | | FR‑3 | Self‑Contained Codec – if the source video uses a non‑baseline H.264 profile, embed a lightweight software decoder (e.g., libavcodec) in the MP4 as a udta atom. Playback‑aware players can fall back to this decoder; otherwise, they ignore it. | Should | | FR‑4 | Preview Truncation – automatically truncate the video to the first N seconds (default = 39 s) and store the original duration in a metadata atom ( origDur ). The truncated clip is the one that plays by default. | Must | | FR‑5 | Cross‑Platform Playback – the file must be playable in: • Windows Media Player (Win 10+) • macOS QuickTime • iOS Safari/AVPlayer • Android ExoPlayer without requiring external plugins. | Must | | FR‑6 | CLI & GUI – expose two interfaces: 1. CLI : nippymp4 --src input.mp4 --id 90834723 --preview 39 --out nippy_90834723.mp4 2. GUI : drag‑and‑drop panel with fields for ID, preview length, and “Make portable”. | Must | | FR‑7 | Integrity Check – embed a SHA‑256 hash of the payload (the truncated video data) in a hash atom. On open, a portable‑aware player can verify the hash and warn if the file is corrupted. | Nice‑to‑have | | FR‑8 | Metadata Export – generate a side‑car JSON file ( nippy_90834723.json ) containing: ID, preview‑duration, original‑duration, hash, creation‑timestamp, and optional user‑tags. | Nice‑to‑have |

[Unique ID] 90834723 (numeric, 8‑digit max) mp4 90834723 39s39 nippyfile mp4 portable

If you are trying to track down or fix a specific file, tell me: | Must | | FR‑3 | Self‑Contained Codec

An MP4 file is “portable” if it adheres to baseline profiles, ensuring compatibility across devices without transcoding. The truncated clip is the one that plays by default

: A widely used digital multimedia container format primarily used to store video and audio.

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